According to Theorist John Bowlby, What Is the Central Function

According to theorist John Bowlby, what is the central function of the attachment system?

A) To allow babies to balance their need to explore with their need to remain safe
B) To help babies avoid coming into contact with unfriendly strangers
C) To ensure that babies receive adequate food and attention from their parents
D) To help parents keep track of where their babies are.